Abstract:The fault F0 of the Fangezhuang coal mine,Kailuan coal group,runs through the whole mine field. Based on the experimental results of the creep for the faults,the data of the faults under different conditions obtained. The influence of mining activity on the faults at different periods is gained through the simulation of fluid-solid coupling and the calculation of seepage creep using numerical simulations software FLAC3D. The results indicate that vertical displacement of floor strata near the faults reaches maximum value. Large tectonic stress on the floor is caused by the faults,which leads to a wide range shear stress area at the same time. The stress concentration is the key factor of the breakage and water bursting of floor. The basic phenomena including the influence of confined water on the overlaying rock and faults,the influence of mining activity on the floor strata,the size and range of influence of the mining activity on the faults,and the time-effect of the influence on the confined water,are described by the simulation results very well,which provides reliable basic data for the safety of the coal production.